Gustav ibbtjggeb



(No Model.) I 2 Sheets-Sheet 1. G. IBRUGGER.

.Oupola Furnace.

No. 240,136. Patented April 12,1881

WITNESSES: INVENI'OR ATTORNEY no model.) 2 She et s -Sheet 2. G'.IBRUGGER. Cupola. Furnace.

No. 240,136. Patented April 12,1881.

. WIYTNESSES: Q k I INVENTOR V ATTORNEY N-PEYERS. PHO10-LIYHOGRAPHEILWASHINGTON D C UNITED STATES PATENT OFFICE.

GUSTAV IBRUGGER, OF NORDEN, PRUSSIA, GERMANY.

CUPOLA-FURNACE.

' SPECIFICATION forming part of Letters Patent No. 240,136, dated April12, 1881.

Application filed May 18, 1880. (No model.)-

To all whom it may concern Be it known that I, GUSTAV IBRi'IGGER, aresident of the city of Norden, in the Kingdom of Prussia, GermanEmpire, havev invented Improvements in Oupola-Furnaces, of which thefollowing is a specification.

In a former application for a patent for a cupola-furnace, which hasbeen filed by me under date of March 25, 1880, I have described acupola-furnace in which a separate collecting trough or well is arrangedbelow the furnace and connected therewith by a central bottom opening orchannel, through which the fire-gases are drawn down into the well andthere burned,

so that the heat of the same can be utilized for melting and unitingwrought-iron with the molten pig-iron from the furnace.

By a number of experiments 1 have found that the heat generated by thecombustion of the gases in the collecting trough or well may be stillfurther utilized for various purposes by conducting them off to thepoint of use. I have further discovered that it is not absolutelynecessary to employ a single bottom opening, but that, on the contrary,better results are obtained when several connecting openings or channelsleading from the furnace to the well below the same are used. Therelative position of the well to the shaft of the furnace is alsoimmaterial, as it may be either directly below or in front or sidewiseof the same, as described.

Instead of conducting the gases of combustion from the shait of thefurnace to the well through the opening through which the meltingpig-iron passes, I arrange, besides, separate channels for the escape ofthe gases, as repeated experiments havedemonstrated that a greaternumber of connecting-channels between the furnace and well prevents thetop smoke of the furnace and admits the more per fect nltilizatiou ofthe fire-gases in the well. As there is no top smoke the furnace can bebuilt considerably higher and charged with a greater quantity ofmaterial, so that the capacity of the furnace is greatly increased.

This invention consists more especially of a cupola-furnace which isconnected by one or more bottom openings with a collecting trough orwell arranged below or in front of the furnace, the well being providedwith adischargeopening, a bridge for supplying the wroughtiron, and aside opening for conducting off the gaseous products of combustion forfurther use.

In the accompanying drawings, Figures 1 and 2 represent, respectively, avertical central and'a vertical longitudinal section of my improvedcupola-furnaoe, in which similar letters of reference indicatecorresponding parts.

A in the drawings represents the collecting trough or well, which inthis case forms a chamber in which the combustion of the gases escapin gfrom the shaft of the furnace A takes place. This well orcombustion-chamber A is either directly below or in front of the furnaceproper, it being separated from the latter by an inclined arch, B. Atthe lowest point of the inclined archB is a vertical connecting opening,I), which extends from an arched recess or niche, a, downward into thewell A. The molten pig-iron and the slag pass from this channel b intothe well A. Besides the connecting-channel b, one or more additionalchannels, at, are arranged in the arch B, through which the gases aredrawn down into the well A. The hot air required for the propercombustion of the gases in the well A is supplied from the main trunk ofthe air-blastpya valved tube,f, and a connecting-channel,g, as shownclearly in Fig. 1.

The well or chamber of combustion, A, is provided with'an inclinedbottom and an opening, through which the molten metal is drawn off. Aside opening, h, serves for conducting off the gases of combustion, sothat they can be ultized for other purposes, as, for instance, formelting metal in a furnace, D, or in crucibles E, (shown in Fig. 2,) orfor heating up air for drying purposes, heating malleable ironpreparatory to tempering, and for other suitable purposes. ln most casesit is advisable to provide a proper supply of heated air, as the same ismore favorable for the combustion of the gases and for a more completeutilization of their heat in thedift'erent applications which are madeof the same.

In the combustion-chamber A a fire-bridge, l, is arranged, upon whichthe Wrought-iron scrap is placed, so as to be properly heated uppreparatory to its being fed into the molten pig-iron collected in thewell A. The latter is gradually united with the wrought-iron withoutimpairing the fluidity of the same.

The advantage of this construction of cupola furnace consists, mainly inthe fact that a continuous working of the same can be substituted forthe intermittent working'heretofore employed.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A cupola-furnace having an arched inclined bottom,the latter being provided with a discharge-opening at its lowermostpoint, and with one or more openings or channels for the fire-gases, incombination with a collectin g Well or chamber of combustion below or infront of the cupola-furnace, substantially as and for the purpose setforth.

GUSTAV IBRUGGER.

Witnesses FRANK Q. ZIMMERMAN, CARL FEHLERT.

